I like the old building myself, although the views aren't as spectacular. I always have the same harbour view room on the 6th floor and never miss the spa and coktails & dinner at Felix. The food is as spectacular as the view. The journey in the lift to the top of the tower as well as the men's room are worth the trip.
It is definetly my favourit hotel in the world, I can't realy manage to put a finger on it, I have staid in many wonderfull places but there is something very special about the Pen HK.
Have a great stay